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1、基数词变序数词的规律。首先,基数词变序数词的规则是按照字母表顺序,一般而言,以t开头的基数词(three,twenty,twelve等)变成序数词时,要在单词前加上th,例如three变成third,twenty变成twentieth,twelve变成twelfth。其次,以f开头的基数词(four,five,forty,fifty等)变成序数词时,要在单词前加上rst,例如four变成fourth,five变成fifth,forty变成fortieth,fifty变成fiftieth。方法：在英语中，基数词变为序数词的方法是：基词加上一个表示“第”的词缀”-th”，比如“firstfirst
2、-th-first-tho如果基词是1-12的数字，则加-st,比如“twelfth”比如“first”-“first-th”-first-tho 如果基词是1-12的数字，则加-st,比如“twelfth”“twelfth-st”“twelfth-st”。 如果基词是13-19的数字,则加-teen,ktft11thirteenth-thirteenth-teen-thirteenth-teeno 如果基词是20-90的数字，则加-ty,比如fortieth-fortieth-ty-fortiethelfth-st-twelfth-st0 如果基词是13-19的数字，则加-teen,tt11
3、thirteenth-thirteenth-teen-thirteenth-teeno 如果基词是20-90的数字，贝U加-ty,比如“fortieth”-“fortieth-ty”-“fortieth-ty”。 如果基词是I-19的数字，贝!j加-th,tk11second-second-th-second-tho 如果基词是,O,则加“zero，比如“hundredth”-hundredth-zero-hundredth-zero0 如果基词是T,则加“first，比如ten-ty”。 如果基词是I-19的数字，则加-th,tklsecond-second-th-second-tho 如果
4、基词是“0”,则加“zero”，比如“hundredth”-hundredth-zero*-hundredth-zero 如果基词是T,则加“first”,比如“tenth”-“tenth-first”-“tenth-first”。 如果基词是2,则加“SeConC,tttwelfth-twelfth-second-twelfth-second0 如果基词是“3,则加“third“，比如“third”-“third-third”-“thirdth”“tenth-first”-tenth-firsto 如果基词是2,则加“second,tttwelfth-twelfth-second-twelf
5、th-secondo 如果基词是“3,则加“third”，比如“third”“third-third”-“third-third”。 如果基词是“4”,贝WlTfourth”,比如fourth”-fourth-fourth”“fourth-fourth”。 如果基词是“5“，则加“fifth”，比如“fifth”-“fifth-fifth”“fifth-fifth”。 如果基词是-third”。 如果基词是“4”,则加“fourth“，比如“fourth”-“fourth-fourth”-“fourth-fourth”。 如果基词是“5“，则加“fifth，比如“fifth”-“fifth-f
6、ifth”-fifth-fifth”。 如果基词是“6”,则加“SiXth”，比如“sixth”SiXthTiXth”-“sixth-sixth”。 如果基词是7,则力口seventh”,比如seventhseventh-seventh-seventh-seventho 如果基词是“8“，则加“eighth“，比如“6“，则加“SiXth”，tksixth-sixth-sixth-sixth-sixth 如果基词是7,则加“seventh，比如seventh-seventh-seventh-seventh-seventho 如果基词是8,则加eighth”,11eighth-eighth-ei
7、ghth-eighth-eighth,o 如果基词是“9”,则加“ninth”,ninth-ninth-ninth-ninth-nintho 如果基词是“1-10”，则加“thefirst”，比如“first”-“thefirst，eighth-eighth-eighth-eighth-eightho 如果基词是“9,则加“ninth,11,ninth-ninth-ninth-ninth-ninth% 如果基词是“1-10“，则加“thefirst，比如“first”-“thefirst，second-thesecond,third-thethird,fourth-thefourth,fift
8、h-thefifth,sixth-thesixth,seventh-theseventh,eighth-theeighth,ninthsecond-thesecond,third-thethird,fourth-thefourth,fifth*-thefi代h“，sixth-thesixth,seventh-theseventh,eighth-theeighth,ninth-theninth*,tenth-thetenth,eleventh-theeleventh,twelfth-thetwelfth,thirteenth-thethirteenth,fourteenth-thefourtee
9、nth1,fifteenth-thefifteenth-theninth,tenth-thetenth,eleventh-theeleventh,twelfth-thetwelfth,thirteenth-thethirteenth,fourteenth-thefourteenth,fifteenth-thefifteenth,sixteenth-thesixteenth,seventeenth-theseventeenth,eighteenth-theeighteenth,nineteenth-thenineteenth,twentieth-thetwentieth,thirtieth-th
10、ethirtieth,sixteenth-thesixteenth,seventeenth-theseventeenth,eighteenth-theeighteenth,nineteenth-thenineteenth,twentieth-thetwentieth,thirtieth-thethirtieth,fourtieth-thefourtieth,fiftieth-thefiftieth,sixtieth-thesixtieth,seventieth-,theseventieth,eightieth-theeightieth,ninetieth-theninetieth,ahundr
11、edfourtieth-thefourtieth,fiftieth-thefiftieth,sixtieth-thesixtieth,seventieth-theseventieth,eightieth-theeightieth,ninetieth-theninetieth,ahundredth-thefirsthundredtho基数词在变为序数词时，规则如下：1.1-10的基数词与序数词在拼写上保持一致；2.11-19的基数词在词尾加th；3.20-90的基数词，词尾加ieth-the第20th,但是twentieth-thetwentieth-thefirsthundredth基数词在变
12、为序数词时，规则如下：1.1-10的基数词与序数词在拼写上保持一致；1.11- 19的基数词在词尾加th；3 .20-90的基数词,词尾加ieth-the第20th,但是twentieth-thetwentieth；4 .百位以上的基数词在词尾加ousth-thefirstthousandth”,但是,tenthousand-thetenthousandth；5 .字母w,y,x,ch,sh作为词首的基数词，变为序数词时需要加“th”。注意：IOoo-9999是两位数，变序数词时，十位th”;6 .百位以上的基数词在词尾加ousth”-thefirstthousandth,但是tenthous
13、and-thetenthousandth；7 .字母w,y,x,ch,sh作为词首的基数词，变为序数词时需要加“th”。注意：Iooo-9999是两位数，变序数词时，十位数和个位数需要分开处理：1 .两位数的十位数为基数词的hundredth-thehundredth；2 .两位数的个位数为基数词的tenth-thetenth；3 .百位数的基数词保持不变。4 .小数的基数词表示方法：1/2one-half,1/4one-数和个位数需要分开处理：1 .两位数的十位数为基数词的hundredth-thehundredth；2 .两位数的个位数为基数词的tenth-thetenth；3 .百位数的
14、基数词保持不变。4 .小数的基数词表示方法：1/2-one-half,1/4-one-quarter,1/8-one-eighth,3/4-three-quarters基数词变序数词的规律：1 .除了th,在基数词后添加“th”。2 .十位数是th,在其后面添加W。例：one-hundred-onehundredthone-thousand-onethousandthquarter,1/8-one-eighth,3/4-three-quarters基数词变序数词的规律：1 .除了th,在基数词后添加“th”。2 .十位数是th,在其后面添加“th”。例：one-hundred-onehundredthone-thousand-onethousandthtwelve-year-twelfthtwenty-two-year-
